./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &
./a.out < wait1.txt &